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bandoristation's Issues

websocket 请求应该只返回更新的数据

看了一下目前的情况，目前 WebSocket 请求是每半秒钟返回一次所有的数据，即使没有更新也会返回，这样会不会让服务器压力过大，或者浪费流量？

个人建议是 WebSocket 连接完毕后，除了第一次推下全部消息，以后每次都只推更新的消息，客户端做缓存处理；如果没有更新就不要推送了，避免消息过多。如果长时间没有消息，可以发一个心跳包保持连接活跃（或者让客户端主动发心跳包，更好）。

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